Probably the same thing that happens when a gay human male meets a human female. A better question would be, is a gay human male affected by a gay male Deltan? Or does a heterosexual human male suddenly get attracted to a gay male Deltan?

These 'super pheromones' should heighten sexual urges. So for a gay man/woman that would still attract them to the same gender of Deltan that they have always been attracted to.

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That depends on how the pheromones work. If they are "merely" aphrodisiacs, what you say is correct. But if they work like Orion pheromones, ie working on specific sexes, then things would be different (though even then, it depends on just what the mechanism the pheromones use to get the reaction, and what specifically causes the homosexuality in the human).

^ But in Deltan society, sex isn't just for procreation. It is part of literally every facet of their lives. Deltans are pretty much f*cking all the time. So it would seem that their bodies would produce pheromones constantly, to serve this purpose.

It's been a while since I saw TMP, but I don't recall any mention there of Deltan's having overpowering pheromones (of course I could be wrong). From what I gathered they were just a very open and 'hedonistic' people, for who sex is an expressive part of their society, whilst also being very intense (most likely due to their telepathy)—for a people like that pheromones wouldn't really be necessary, as they would just have consensual sex with whoever they wanted. Which is why Ilia (and presumably all other who chose to leave Delta IV) took an Oath of Celibacy—as she says, to protect the “sexually immature” species they would encounter. If pheromones were involved, in order to live a life off of Delta IV they would need to take something that would suppress them or else they'd face sexual abuse and unwanted advances everywhere they went.

As for whether a homosexual man/woman would be attracted to an opposite sexed Deltan, I would say no. I do find some women pretty/stunning/attractive, but have no desire to sleep with them, and her being bald wouldn't change my opinion.

^ Where was that established, like I said I'm a little rusty on my TMP.

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Although pheromones are not mentioned, Ilia does deliver the line "My oath of celibacy is on record, Captain" fairly early in the movie. If you jump to approx. 32:00 (theatrical version), you can review the scene in question.

Male, female, gay, straight, Orion, Deltan. I don't like the idea of being overwhelmingly attracted to someone because of the way they smell. Its like being drugged to have sex with someone. I don't find it erotic or sexy at all. Exotic maybe.

Off-putting for a Deltan too I'd imagine. Having people fawning over you because they are too immature sexually to control themselves.

Male, female, gay, straight, Orion, Deltan. I don't like the idea of being overwhelmingly attracted to someone because of the way they smell. Its like being drugged to have sex with someone. I don't find it erotic or sexy at all. Exotic maybe.

Off-putting for a Deltan too I'd imagine. Having people fawning over you because they are too immature sexually to control themselves.

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If it means anything, the most current research suggests that people don't respond to pheromones of someone from the opposite sex if they are attracted to the same same (as opposed to someone attracted to the opposite sex). Pheromones don't simply put someone in the mood.